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Ancient Shallow Sea Floor

A photograph of the uplifted shallow sea bottom at Dinosaur Ridge, Colorado, taken on August 3, 2001, 5:25 pm. Dinosaur Ridge is a hogback, west of Denver, that includes many tracks from dinosaurs of the Jurassic and Cretaceous. The ripples in this shallow sea bottom were formed 100 M yrs ago, and are part of the Dakota Group.